Contracting core for cement-lined pipe.



G. W. PRIEST. CONTRACTING CORE FOR CEMENT LINED PIPE.

APPLICATION FILED JUNE :3, 1910.

1,171,641; Patented Feb. 15, 1916. I

2 SHEETS-SHEET I 21522265565: flyeiziort' Y A UNITED s'rA'rns PATENT or -Fron GEORGE w. PRIEST. or NEWTON, MASSACHUSETTS;

CONTRACTING c'onn'ron amateur-LINED PIPE.

Specification of Letters fatent; P t t d Feb. 15, 191 6.

Application filed June .3, 1910. seii uo. 566507;.

To all whom it may concern: V Be it known that I, GEoRon'l/V. PRIE T, residing at Newton, in the county of Middlesex and State of Massachusetts, have, in vented an Improvement in Contracting Cores for Cement-Lined Pipe, o-fwhich the following is a specification.

This invention relates to a contracting core, especially adapted for use in molding cement-lined pipe. In lining pipe with cement much difficulty is experienced in forming the lining with a smoothsurface.

Cores of various kinds have been employed,

concentric with the pipe and will have a.

smooth surface.

This invention has for its object the construction of a contracting-core for a cement-lined pipe which when expanded will present a smooth continuous surface and which may be contracted for the purpose of withdrawal, and also the provision of a flexible sheath adapted to inclose the v contracting core which is made as a continuous tube of rubber or canvas or some equivalent flexible or elastic material which will not be affected by the alkali contained in the cement composing the lining of the pipe, and of a size corresponding to the size of the expanded core or thereabout, so as to be held taut by said expanded core to present a smooth unbroken or continuous sur-' face for the engagement therewith of the lining of the pipe.

I prefer to employ a rubber sheath for the reason that it is easy to handle and is not only yielding but elastic, so that when the core is expanded it may be stretched to thereby insure a smooth continuous surface,

and also may be withdrawn from the lined pipe by reversing it or turning it inside out, so that it may be peeled off of the cement lining as contrasted to being drawn off by ashdmgmovement! Figure 1 is a plan view of a contracting core fora cement-lined pipe embodying this 1nventi on, the parts being in the position theywill occupy when the core is expanded in the pipe. Fig. 2 is a similarview showmg the parts collapsed. Fig. 3 1s a long tudlIlHlVQIijlCdl section of a portlon of the contracting core. Fig.4 is a-deta-il to be I referred to.

. As represented in the drawing the pipe to be lined with cement is composed of two sheet metal pipes (Land 1), with cement arof the inner pipe Z), but so far as my invention is concerned the pipe to be lined with ranged between them and also on the inside cement may beof any well known or suitable construction.

0 represents a contracting tubular, cylin- "drical shell of sheet metal, hence is quite thin. It is made of any suitable length to extendlfrom end to end of the pipe tobe lined, and correspondsinshape to the lining to be formed in the pipe. It is slittedfrom' end to end, as at c. 7

As a means for contracting and expanding the slitted shell I have herein provided a central shaft 6, made tubular to provide for a. tie-rod 7, which may be extended through it, and said shaft is supported by brackets 16 which are attached to the inside of the shell and extend inward toward the center th ereof. Said shaft has rigidly secured to it at such point or points as may be desired, collars 6 having short arms 6 extendedfrom them, and the extremities of said arms are loosely connected with short arms 6*, see Fig. 4, which are attached to the inside of the shell. The arms 64. are arranged at one side of the slit, and the brackets e at the other side thereof, so that as the shaft is turned, the walls of. the

shell at opposite sides of the slit are moved toward and from each other for the 'purpose of contracting and expanding the shelL'. Loclzing devices are provided for locking the actuating-means thus described when the shell is expanded, and, as here shown, said locking-devices consist of short armsg attached to the inside of theshell, at that side of the slit opposite'the points of attachment of the arms 6 which extend over Said arms 6*, and saidv arms 9 have holes inthe arms 6* when the shell is ex panded, and when so disposed relative to each other, an upright rod 70 is passed through the holes in .said arms 9 and 6* which secures them together.

The actuating-means here shown is simple and effective and so also are the locking-devices, but my invention is not limited in all particulars to the particular construction here shown of saidmeans and devices.

For assisting in forming the lining truly concentric to the pipe, and giving it a smooth surface when hardened, I have provided aflexible sheath 2', preferably composed of rubber, or it may be made of can'- vas or some equivalent, flexible or elastic material. Said sheath is made as a tube, which is continuous and unbroken throughout its length, and of a sizeto correspond to the size of the inner face of the lining;

and said sheath is adapted to be drawn onto the contracted shell, and when said shell isexpanded to be tightly stretched so as to present a smooth continuous surface for the lining. As an easy way of drawing the flexible or elastic sheath onto the core, even though said core is contracted, one end of the sheath may be brought into engagement with one end of the core, and then the sheath may be reversed or turned inside out, and thus drawn onto the core. 'But this characteristic feature of the sheath is of much more importance when being withdrawn from. the lined pipe, as it admits of its being peeled off of the cement lining as contrasted to being drawn up bya sliding movement.

It is intended that the core herein described shall remain in the cement-lined pipe until the cement has hardened, or at least has become sofirmly set that it is self- Copies of this patent may be obtainedfor five cents each, by addressing the Commissioner of Patents supporting, then the core is contracted and withdrawn and then the sheath is withdrawn by reversing it.

' The sheath does not adhere'to the lining, and as it has a continuous smooth unbroken surface, the surface of the lining is likewise formed, and also has a very good finish not;

otherwise obtainable-sofar as I am aware.

I claim:-

1. A contracting core for cement-linedranged on the interior of the shell. for supholes in said arms for locking them, substantially as described. I

2. An expansible core for cement hned pipes including a sectlonal shell, means for operating the shell to form the same into atrue cylindrical, or into a body partly collapsed, and a flexible sheath adapted tobe operated with and by the shell to present an unbrokensmooth molding surface to the exterior of the shell. I

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

GEORGE W. Pmns'r. V

Witnesses B. J. NoYEs, H. BjDAvIs.

Washington, D10. 

